Crimping and rebounding control method of lateral wall of advanced high-strength steel stamping part

Abstract

The invention discloses a crimping and rebounding control method of a lateral wall of an advanced high-strength steel stamping part. Lateral wall crimping and flange sinking phenomena easily caused when an advanced high-strength steel plate is stamped and formed are controlled by changing a die structure. The main method disclosed by the invention as follows: processing lateral walls of a convex die and a concave die into arc surfaces as a stamping and rebounding compensation surface; and bending a plate material along with the dies in a forming process to generate reverse deformation stress. Due to high strength, the bent lateral wall rebounds and deforms; reverse deformation stress of previous lateral wall is balanced; crimping of two lateral walls towards the outer side caused by rebounding is avoided when the stamping is finished, and then the die surface of the concave die contacting the edge of a flange is machined into an inclined plane which inclines upwards, and a blank holder is also an inclined plane with the same angle, so that the flange edge of a spare part can compensate sinking amount and the sinking flange edge becomes a horizontal state so as to obtain the spare part with good shape when the lateral wall rebounds. The crimping and rebounding control method disclosed by the invention has important realistic use value to improve forming precision of the advanced high-strength steel.

Description

Technical field: [0001] The invention relates to a method for controlling the curling and springback of the side wall of an advanced high-strength steel stamping part, which mainly uses the side wall anti-bending structure of the stamping die to control the curling and springback of the side wall that occurs during sheet metal stamping forming, and belongs to the technical field of stamping forming . Background technique: [0002] In recent years, the development of advanced high-strength steel is very rapid, and the amount of use is also increasing year by year. However, there are still many problems that are difficult to solve in the forming process of advanced high-strength steel. The springback phenomenon is a very common problem. Side wall curling is A special form of springback for advanced high-strength panels. Taking the hat-shaped part as an example, it is a stamping part widely used in many industries. It often appears as a very important structural part, with a l...

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Problems solved by technology

However, the forming quality of this advanced high-strength hat has been difficult to control. Due to the special opening structure of the cross-section of the hat and the high strength of the steel plate, it will have a very serious springback phenomenon. , Due to the effect of the rounded corners of the convex and concave dies or the effect of the drawbead, the stress distribution is uneven or the stress is distributed in a gradient direction in the thickness direction of the sheet metal. In the process of bending and straightening, the deformation of the two sides of the sheet is inconsistent : When the material enters the die fillet and bends, the inner surface is subjected to tensile stress and the outer surface is subjected to compressive stress. After being straightened by the side wall through the die fillet, the inner surface is subjected to compressive stress and the outer surface is subjected to tensile stress; After the punch leaves the cavity, due to the elastic recovery, the stress state of the inner and outer surfaces changes again. The inner surface is subjected to tensile stress and the outer surface is subjected to compressive stress, causing the parts to curl outward and the flange to sink, and even appear Defects of overall distortion, the appearance of these defects will make the assembly of parts difficult, and in severe cases, the workpiece cannot be welded due to the excessive gap

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